Wine Faults Flashcards
What is the origin of TCA?
A mold that interacts with other compounds - can be present in corks and/or winemaking implements or in the winery itself
At what level is TCA detectable?
2 to 7 parts per trillion
Name the source of 3 types of sulfur odors
Sulfur Dioxide (“burnt matches”), Hydrogen Sulfide (rotten gggs”), Mercaptan (“Garlic/Onions”)
The sensory effects of SO2 are related to what?
pH - the higher the acidity the greater the effect
What odor is produced when Hydrogen Sulfide is present?
Rotten Eggs
What causes HS2 to be present in wine?
Lack of oxygen
What odor is produced when Mercaptan is present?
Garlic/Onions
What causes Mercaptan?
A combination of sulfur and ethanol
What bacteria can survive in wine?
Lactic bacteria and acetobacter
What odor does acetobacter cause?
Vinegar from conversion of alcohol into acetic acid
What is asesence?
Wine fault due to high levels of volatile acidity (acetic acid) and ethyl acetate
What causes Butryic acid and what is odor?
can come from the grapes or over-aggressive MLF. Smells like rancid butter/spoiled cheese/baby vomit
Too much lactic acid can cause what odor
fermented smell: pickles, yogurt, sauerkraut
What is ethyl acetate
Most common ester produced by yeast. Formed by ethanol and acetic acid - high levels lead to a nail polish remover/airplane glue odor
What causes “geranium fault”?
the metabolism of sorbic acid via lactic acid
